Define and write down the conditions under which you'll enter a position. "Buy during uptrend" isn't specific enough. Something like this is much more specific and also testable: "Buy when price breaks above the upper trendline of a triangle pattern, where the triangle was preceded by an uptrend (at least one higher swing high and higher swing low before the triangle formed) on the two-minute chart in the first two hours of the trading day."
ECN/Level 2 quotes: ECNs, or electronic communication networks, are computer-based systems that display the best available bid and ask quotes from multiple market participants and then automatically match and execute orders. Level 2 is a subscription-based service that provides real-time access to the Nasdaq order book composed of price quotes from market makers registering every Nasdaq-listed and OTC Bulletin Board security. Together, they can give you a sense of orders being executed in real time.

Astute readers will realise that the above guidance is mainly taking different angles to help prepare for and guide decision making by the investor. The ability to confidently make decisions is vital for investment profits and long-term success. This pdf about the decision making models of Charlie Munger (business partner to Warren Buffett at Berkshire Hathaway - both are certified investment immortals) is almost certain to prove helpful.
The solution to both is investing in stock index funds and ETFs. While mutual funds might require a $1,000 minimum or more, index fund minimums tend to be lower (and ETFs are purchased for a share price that could be lower still). Two brokers, Fidelity and Charles Schwab, offer index funds with no minimum at all. Index funds also cure the diversification issue because they hold many different stocks within a single fund.
An asset class that your author has been researching substantially is cryptocurrency. Bitcoin and the other alt coins, appear to be like very few other investment assets and so far moves in very different ways to almost every other asset. While it is very volatile and high risk and has quite a learning curve, it might be useful for some investors to understand and add to their portfolio.

Risk tolerance is a psychological trait that is genetically based, but positively influenced by education, income, and wealth (as these increase, risk tolerance appears to increase slightly) and negatively by age (as one gets older, risk tolerance decreases). Your risk tolerance is how you feel about risk and the degree of anxiety you feel when risk is present. In psychological terms, risk tolerance is defined as “the extent to which a person chooses to risk experiencing a less favorable outcome in the pursuit of a more favorable outcome.” In other words, would you risk $100 to win $1,000? Or $1,000 to win $1,000? All humans vary in their risk tolerance, and there is no “right” balance.
What would make me sell: Sometimes there are good reasons to split up. For this part of your journal, compose an investing prenup that spells out what would drive you to sell the stock. We’re not talking about stock price movement, especially not short term, but fundamental changes to the business that affect its ability to grow over the long term. Some examples: The company loses a major customer, the CEO’s successor starts taking the business in a different direction, a major viable competitor emerges, or your investing thesis doesn’t pan out after a reasonable period of time.